JPS5815345A - Radio paging receiver - Google Patents

Abstract

PURPOSE:To smoothly communicate a caller with the carrier of a receiver, by informing the state of impossible reception to the carrier, if the receiver can not receive a reception signal for a prescribed time or over. CONSTITUTION:Electromagnetic waves received in an antenna 1 are demodulated at a reception 2, transmitted to a collation section 4, compared with the storage of an ROM3, transmitted to a driving section when coincident, and drive a speaker 6 and a display section 7. On the other hand, an output of the section 2 is transmitted to a signal detection section 8 and a detection signal is outputted when a specific signal is hardly recognized in the degree of reception of a signal from a transmitter. The ouput signal is transmitted to an integration section 9 and the integrating time is calculated. In this case, when the integrating time is elapsed for a prescribed time, an outout signal of the section 9 is displayed on a display section 7. The receiver in the impossible reception state is informed to a carrier of the receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless individual selective call receiver that selects a particular receiver.

Conventionally, individual selective calling receivers that select a specific receiver, so-called pagers, have been a one-way communication means for calling only, and when the receiver is in an electric field below the sensitivity of the receiver or If the radio unit is in a malfunction state, the caller who calls the receiver will not be able to call the receiver again and again, unless the called party carrying the receiver knows that it is in a weak electric field or is in a malfunction state. However, it has the disadvantage that it cannot call the called party.

As a countermeasure, a system detects the so-called S/N ratio between the signal received by the receiver and the noise, and when the S/N becomes worse than a certain value, a display indicates this. be. Also, the transmitter transmits a certain code,
Some systems are designed to display a message on a display when the receiver cannot receive a particular code. Note that as the display device, a device that generates sounds using two sounding bodies may be used.

By the way, such a wireless individual selective call receiver.

To be carried in places where reflected waves and direct waves from structures such as the earth and buildings interfere with each other, causing large electric field fluctuations, or in places where radio waves cannot reach or are basically not available, such as buildings or underground. Therefore, the received electric field changes in small increments from moment to moment.

Also, the 2-select call receiver does not need to constantly receive radio waves sent from the transmitter.

It is only necessary to be able to receive radio waves when there is a selective call of one's own, and the time required to receive the selective call is very short, although it depends on the number of calls.

Therefore, if the signal-to-noise ratio simply deteriorates or a specific code cannot be received, the display will be displayed in small increments if the signal is immediately displayed with a sound or the like.

This causes anxiety in the person carrying the receiver. Moreover, when it makes a sound, it has the disadvantage that it becomes a source of unnecessary noise in the surrounding area.

In order to eliminate the above-mentioned drawbacks, the present invention provides a reception system that notifies the user that the receiver is unable to receive data when the receiver is in a weak electric field or the wireless section of the receiver is in a failure state and becomes unable to receive data for a certain period of time. The purpose is to provide machines.

Embodiments will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the invention. Radio waves sent from a transmitter and modulated according to a number unique to the receiver are received by the antenna 1.

The radio section 2 demodulates the signal. The demodulated signal demodulated by the radio section 2 is guided to the collation section 4. The storage unit 3 stores a number unique to the receiver, and is composed of, for example, a ROM (read only memory). The collation unit 4 sends a readout signal to read the storage contents of the storage unit 3, reads the storage contents to the storage unit 3, and compares and compares the output signal of the storage unit 3 with the demodulated signal of the radio unit 2. If both signals match as a result of the matching comparison, the matching section 4 outputs a matching signal.
It is input to the display moving section 5. The driving section 5 is a circuit that drives the sounding body 6 and the display section 7. The sounding body 6 converts electrical signals into sound, and is composed of a so-called speaker or the like. Display section 7 ii LED, LCD, ECD
It is composed of display elements such as. Therefore now,
When the matching signal is output from the matching section 4, the two sounding bodies 6 make sounds, and at the same time, a display is made on the display section 7.

In addition to outputting a demodulated signal to the verification unit 4, the radio unit 2 also outputs a demodulated signal to the verification unit 4.

A signal is also output to the signal detection section 8. The signal detection section 8 is based on an out-of-band noise component detection method that utilizes the fact that the out-of-band noise component of the demodulated signal of the receiver changes depending on the presence or absence of a signal, or when there is an input signal to the radio section 2, This is based on a detection method that utilizes the increase in current in section 2 to detect this increase in current. These detection methods are frequently used for S/N determination in squelch circuits used in FM receivers and the like.

Signal detection section 8Fi also. The strength of the received signal may be detected based on whether or not codes having a specific configuration transmitted from the transmitter at regular time intervals can be received.

The integrating section 9 is an integrating circuit that integrates the output time of the signal detecting section 8, and outputs the output signal when the output time of the signal detecting section 8 has elapsed for a certain period of time. The output signal of the integrating section 9 is transmitted to the driving section 5.
is input to drive one sounding body 6 and display section 7.

Operation unit 10 An external operation unit used when the receiver user wants to cancel the operation of the Fi integration unit 9 and know the reception status at that point by external input. This is to help you understand the situation you are in.

The signal from the signal detection unit 8 input to the integration unit 9 is
The result will be as shown in Figure 1). Here, a state where the level is high is a state in which the signal from the transmitter cannot be received, that is, a non-reception state. That is, the level is high in a non-receiving state, and low in a receiving state. When such a signal is input to the integration section 9, the integration section 9 integrates the time period during which the input signal level is high, and when a certain period of time T has elapsed as shown in FIG. Outputs the output signal shown in . However, the signal input to the integrating section 9 is
In case the fixed time is less than T as shown in diagram (b).

From the integration unit 9, as shown in Fig. 2+D, (Fig. 2 1) (
No output is output to the position corresponding to b).By the way, the fixed time T set for the integrating section 9 is determined as follows. Now, as shown in Figure 3.

The individual code of one receiver is time T! In the selective calling method, in which each code is repeated N times and the time required for one individual code is 'J''2, the time TO during which the receiver cannot receive the signal is less than or equal to T1 (N-1) - 'r2. If so, the receiver can receive the called number at least once out of the N calls sent by the transmitter.On the other hand, if the time is longer than To, the receiver cannot receive the called number even once. There may be cases where this is not the case.

If the fixed time period T is T>To, there is a possibility that the device itself was called during this period of time T. Therefore, the fixed time period for which the integrating section 9 integrates may be set as To.

Furthermore, the fixed time period may be determined completely independently, for example, 10 minutes or 30 minutes, without following the configuration of the transmission signal as shown above. now.

Uniquely decide on a certain period of time as 10 minutes. If both the calling party and the called party are aware of this time, which is 10 minutes, the calling party will not be able to receive a response from the called party even after 1 minute has passed after making a call. In some cases, when a caller makes a call, the receiver happens to be in a weak electric field and is unable to call the receiver.

It is possible to take the procedure of assuming that there is a problem and then calling the receiver again. Also.

If the receiver is in a weak electric field or in a fault condition for 10 minutes,
The person carrying the receiver is notified of this by a sound or display. When receiving this notification, the person carrying the receiver operates the operating section 10 shown in FIG.

All you have to do is find a place where you can receive regular radio waves. After that, if there is a call from the second caller, the phone will ring and the call will be accepted. Alternatively, if the receiver reports that reception is not possible, the contact is confirmed by checking with a predetermined caller to see if there has been a call during this time, or by checking with a specific designated location. You can.

As explained above, according to the wireless individual selective calling receiver according to the present invention, the signal detection circuit and the output time of the output signal from the signal detection circuit are integrated, and when the integrated time elapses over a certain period of time, the output signal is output. 9. Integration circuit for output; and a display section that displays a display according to the output signal, so that when the receiver cannot receive the received signal for a certain period of time or more, it notifies the person carrying the receiver that the receiver is in an unreceivable state; This can bring about effect 7 of facilitating communication with the caller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a wireless individual selective calling receiver according to the present invention, FIG. 2 is a time chart used to explain input and output signals of the integrating section, and FIG. FIG. 6 is an explanatory diagram used to explain an example of determining a certain time period for an integration section. 1...Antenna, 2...Radio section, 3...Storage section, 4
... Collation unit, 5... Drive unit, 6... Sounding body, 7.
... Display section, 8... Signal detection section, 9... Integration section, 1
0...Operation unit. 'j$1 figure

Claims (1)

[Claims] 1. In a selective calling receiver that receives various signals sent from a transmitter and responds only to specific signals,
A signal detection circuit that outputs when the degree of reception of various signals from a transmitter is lower than the degree that a specific signal can be identified without trouble, and the output time of the output signal of the signal detection circuit is integrated,
an integration circuit that outputs an output signal after a certain period of time;
A wireless individual selective call receiver comprising a display section that displays a display according to an output signal of the integration circuit.